CONSOLIDATED STATEMENTS OF OPERATIONS - USD ($) shares in Thousands, $ in Thousands	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
CONSOLIDATED STATEMENTS OF OPERATIONS
REVENUE	$ 669,761	$ 700,131
COST OF SERVICES	546,292	583,038
Gross profit	123,469	117,093
SELLING, GENERAL AND ADMINISTRATIVE EXPENSES	88,214	92,924
GAIN ON SALE OF ASSETS	(350)	(554)
Operating income	35,605	24,723
OTHER INCOME (EXPENSE):
Interest income	3	64
Interest expense	(1,497)	(2,617)
Changes in the fair value of contingent earn-out obligations	1,186	2,272
Other	(69)	25
Other income (expense)	(377)	(256)
INCOME BEFORE INCOME TAXES	35,228	24,467
PROVISION FOR INCOME TAXES	8,737	6,751
NET INCOME	$ 26,491	$ 17,716
INCOME PER SHARE:
Basic	$ 0.73	$ 0.48
Diluted	$ 0.73	$ 0.48
SHARES USED IN COMPUTING INCOME PER SHARE:
Basic	36,286	36,674
Diluted	36,499	36,905
DIVIDENDS PER SHARE	$ 0.115	$ 0.105